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MFV r272496:

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Add tunable for number of metaslabs per vdev
(vfs.zfs.vdev.metaslabs_per_vdev).  The default remains
at 200.

Illumos issue:
    5161 add tunable for number of metaslabs per vdev

MFC after:	2 weeks
This commit is contained in:
Xin LI 2014-10-04 08:29:48 +00:00
commit 523b4c7fdf
1 changed files with 11 additions and 2 deletions
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13
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c
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@ -155,6 +155,15 @@ static vdev_ops_t *vdev_ops_table[] = {
};
/*
* When a vdev is added, it will be divided into approximately (but no
* more than) this number of metaslabs.
*/
int metaslabs_per_vdev = 200;
SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, metaslabs_per_vdev, CTLFLAG_RDTUN,
&metaslabs_per_vdev, 0,
"When a vdev is added, how many metaslabs the vdev should be divided into");
/*
* Given a vdev type, return the appropriate ops vector.
*/
@ -1663,9 +1672,9 @@ void
vdev_metaslab_set_size(vdev_t *vd)
{
/*
* Aim for roughly 200 metaslabs per vdev.
* Aim for roughly metaslabs_per_vdev (default 200) metaslabs per vdev.
*/
vd->vdev_ms_shift = highbit64(vd->vdev_asize / 200);
vd->vdev_ms_shift = highbit64(vd->vdev_asize / metaslabs_per_vdev);
vd->vdev_ms_shift = MAX(vd->vdev_ms_shift, SPA_MAXBLOCKSHIFT);
}